National Instruments 320682C in

Chapter 2 Formatting and I/O Library

Note: When using both the b

and o

modifiers on an integer specifier, the b

modifier

must be first.

Formatting Floating-Point Modifiers (%f)

bn Specify Length. The b floating-point modifier specifies the length of the

floating-point argument, or the length of an individual array element, in bytes. The

default length is 8 bytes; therefore, double-precision values do not need this modifier.

Single-precision floating-point values are indicated by b4. 8 and 4 are the only valid

values for

Specify Array Offset. You use the i modifier to specify an offset within a

floating-point array argument. It indicates the location within the array where

processing is to begin.

is the zero-based index of the first element to process.

Thus, %10f[i2] applied to a source floating-point array reads the 10 floating-point

values from the third through the twelfth elements of the array. The i modifier is

valid only if rep is present. If the i modifier is used with the z modifier, then n is in

terms of bytes.

zTreat String as Floating-Point Array. The z floating-point modifier indicates that

the data type of the corresponding argument is a string. Nevertheless, the data in the

string is treated as a floating-point array. The z modifier is valid only if rep is

present.

wn Specify String Size. The w floating-point modifier specifies the exact number of

bytes in which to store a string representation of the floating-point argument, in the

event that the value is converted to a string format. Any non-negative value can be

entered here. If n is less than the number of digits required to represent the

floating-point number, an asterisk (*) will be inserted into the string to signify an

overflow. The default for n is zero, which indicates that the value can occupy

whatever space is necessary.

pn Specify Precision. The p floating-point modifier specifies the number of digits to the

right of the decimal point in a string representation of the floating-point number. You

can lose significant digits by attempting to conform to the precision specification. If

the p

modifier is omitted, the default value is p6.

en Specify as Scientific Notation. The e floating-point modifier specifies that a value

be converted to string format in scientific notation. If omitted, floating-point notation

is used.

is optional and specifies the number of digits in the exponent. For

example, %f[e2] formats 10.0 as 1.0e+01. If

is omitted, a default of three is used.

fSpecify as Floating-Point Notation. The f floating-point modifier specifies the

value to be converted to string format in floating-point notation. This is the default.